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Ward
Mathematics
25 January, 03:58
5x-7y=-2
-5x-10y=-15
+1
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1
)
Deacon
25 January, 04:07
0
{5x-7y=-2
{-5x-10y=-15 (+)
5x-5x-7y-10y=-17
-17y=-17 / : (-17)
y=1
5x-7 * 1=-2
5x-7=-2 / + 7
5x=5 / : 5
x=1
Solution: (1; 1)
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